Using the ternary operator with string concatenation

Try wrapping your parens around the operation

alert("test: "+ (1 == 2 ? 'hello' : 'world'));

demo: http://jsfiddle.net/hunter/K3PKx/

what this is doing:

alert("test: "+(1==2)?'hello':'world');

is evaluating "test: " + (1==2) as true which outputs 'hello'